节点redis-id生成竞争条件

多个进程可以访问我的redis商店。添加新 使用者 哈希,我执行以下步骤:

1. 增量用户ID
2. 设置用户:[递增的用户ID]。。。

如何将这些步骤捆绑到事务中?

const client = require('redis').createClient();

client.on("connect", () => {
    const multi = client.multi();
    multi.incr("userId", (userId) => {
        console.log("new userId is %s", userId);    // TODO userId should not be null
        multi.set("user:"+userId, {name:"UserName"} );
    });
    multi.exec();    // TODO after the execution I expect to see the key user:null using redis-cli, but it does not exist
});